EPoS Contribution
EPoS Contribution
Dust dynamics from molecular clouds to protoplanetary disks

Ugo Lebreuilly
CRAL, Lyon, FR
Dust grains are the building blocks of protoplanetary disks and planets. Dust regulates the thermal evolution of the disk through its opacity. In addition, it plays a major role in the coupling between the gas and the magnetic field, hence in the disk and jet formation. In observations, the polarized light emitted by the grains can be used to measure the magnetic fields orientation or to estimate the maximum grain size. Nevertheless the dust evolution remains poorly constrained during the early phases of star formation. The dependence of the drag force on the grain and gas properties can lead to a dynamical sorting, in particular for the large dust grains. Assumed to be uniform at low densities, the dust-to-gas ratio can increase up to large values during the protostellar collapse that leads to the protostar and disk formation. I will present our dust dynamics algorithm in the adaptive-mesh-refinement code RAMSES and first collapse and turbulent cloud simulations of gas and dust mixtures with a simultaneous treatment of multiple grains species of different sizes.
Caption: Gas and dust densities for a low mass protostellar collapse 2 thousand years after the formation of the first Larson core. The colors are chosen to match when the dust-to-gas ratio is at its initial value. As can be seen a decoupling between the gas and the dust occurs as the dust collapses faster than the gas.
Collaborators:
B. Commercon, CRAL, FR
G. Laibe, CRAL, FR
Key publication

Suggested Session: Cores2Disks